Water-cooling system for outboard motors



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Filed June 28 H "Win.

O EVINRUDE WATER COOLING SYSTEM FOR OUTBOARD MOTORS Dec. 29, 1925- Patented Dec. 29, 1925.

UNITED STATES PATENT OFFICE.

OLE EVINRUDE, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ELTO OUTBOARD MOTOR (10., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

WATER-COOLING SYSTEM FOR OUTBOARD MOTORS.

Application filed June 28, 1924. Serial No. 722,885.

To all whom it may concern.

Be it known that I, OIiE EVINRUDE, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Water- Cooling Systems for Outboard Motors, of which the following is a specification, reference bein had to the accompanying drawing, forming a part thereof.

This invention relates to a water cooling system for outboard motors.

It relates particularly to a water cooling system in which circulation of the water through the water jackets of the cylinders is effected by the action of the propeller.

An object of the invention is to rovide an improved water cooling system or outboard motors in which there is no mechanical wear and no valves.

Another object is to provide an improved water cooling system for outboard motors in which the rudder is part of the system and is pivotally connected to the transmission 1 housing, the pivotal connection also being part of the system.

Another object is to provide an improved water cooling system for outboard motors which operates efficiently in sandy, muddy or salt water.

Another object is to provide an improved water cooling system for outboard motors which is self-draining.

Another object is to provide an improved water cooling system for outboard motors which operates elliciently when the motor is running at low speed.

- Another object is to provide an improved water cooling system for outboard motors which operates efliciently when the rudder is turned in either direction, in making a turn.

Another object is to provide an improved water cooling system for outboard motors which is simple, efficient, and which may be economically manufactured.

Other objects and advantages will hereinafter appear.

For the purpose of illustrating the invention, an embodiment thereof is shown in the drawings. in which Figure 1 is a side elevation, partly in section, showing the manner in which the arts of the water cooling system are arrange and connected for cooperation together;

Fig. 2 is an end elevation, looking toward the right in Fig. 1;

Fig. 3 is an-enlarged detail view, partly in section;

Figs. 4 and 4 are sections on line 4-4 of Fi l; and

Figs. 5 and 5 are sections on line 55 of Fig. 1.

The water cooling system comprises, in general, a rudder 1 provided with a passage 2, a tube 3, a water jacket 4, and an outlet connection 5 from the water jacket, the tube 3 providing a connection between passage 2 and water jacket 4.

The inlet end of passage 2 may comprise two inlet passages 6 and 7 which terminate adjacent to the propeller 8, so that the blades 9 and 10 thereof force water into the inlet passages 6 and 7 upwardly through passage 2 and tube 3 to water 'acket 4.

The rudder 1 ma e pivotally mounted to the transmission housing 11 by means of pins 12 which pass through lugs 13 cast integrally with the housing, and are positioned with their centers in line with the center of tube 3. The rudder may thereby be swung about dpins 12 and tube 3.

The lower en of tube 3 fits snugly into a seat 14 pressed into rudder 1 at the outlet end of passage 2, and rests upon a shoulder 15 yrvith which seat 14 is provided, as shown in i .3.

A sleeve 16, slidable on tube 3, is pressed into the lower end of a tiller yoke 17 for movement therewith.

The upper end of tube 3 passes loosely through a suitable bracket 18 secured to housing 11 by bolts 19 or other suitable means.

A spring 20 is compressed between bracket 18 and a suitable clamp 21 fixed to tube 3. Spring 20 thereby acts upon clamp 21 to urge tube 3 downwardlyat all times so that a. close fit is always maintained between the lower end of the tube and shoulder 15 of seat 14, to prevent leakage of water at the seat.

A second s ring 22 is arranged between clamp 21 and sleeve 16 to urge tiller yoke 17 downwardly to hold the same in interlocked engagement with rudder 3.

The lower end of tiller yoke 17 is provided with a recess 23 to interlock with a tongue 24 formed on the upper end of rudder 3 at the outlet end of passage 2.

The upper end of tiller yoke 17 is pivot-ally mounted on the lower ortion of a Y-connection 25 soldered or ot erwise connected to the upper end of tube 3, so that thgeY-connection is, in efi'ect, a part of the tu The two branches 26 and 27 of Y-connection 25 are connected to the water jackets 28 and 4 of the cylinders by pipes 29 and 30, respectively.

The tiller yoke 17 and sleeve 16, fixed for movement therewith, may be slided vertically upon tube 3 and Y-connection 25 against the action of spring 22, until tongue 24 is out of interlocking engagement with recess 23. Rudder 1 may then be swun upon pins 12 and Y-connection 25 indepen ently of tiller yoke 17 through an angle of about 180 degrees.

When the tiller yoke is then released, sprin 22 returns it to its former osition and coke the rudder in position a ongside 01' housing 11. Rudder 1 may thereby be folded out of the way and locked in position to facilitate transportation of the motor.

This interlocking engagement of tiller yoke 17 with rudder 1, to permit folding of the rudder out of the way, is described and claimed in my Patent No. 1,524,857 of Feb. 3, 1925, and is only shown and described in this application with suliicient clearness to show the manner in which it may be embodied in connection with the improved water cooling system.

Spring 20 is stifier than spring 22 and is com ressed between bracket 18 and clamp 21 so t at it occupies substantially the entire space between the bracket and clamp, as s own in Figs. 1 and 3. The downward force exerted upon clamp 21 by spring 20 is therefore greater than the upward force exerted on the clamp by spring 22, so that the lower end of tube 3 is always held in its osition against shoulder of seat 14.

ien tiller yoke 17 is raised vertically, spring 22 is compressed to some extent, but not enough to overcome the downward force of spring upon clamp 21.

Connection is connected to water jacket 4 at substantially a right angle to the wall of the cylinder, so that the water in passing upwardly through the connection will be divided into two streams as indicated by arrows in Fig. 1, and pass upwardly around therylinder in both directions and thence out through connection 5. Connection 29 is connected to water jacket 28 in the same manner. A more even distribution of water around the cylinders is thereby efiected.

An outlet connection 31, similar to connection 5, is provided for water iacket 28.

The entrance to inlet opening 6 is cut at an angle, as shown in Fig. 4, so that when the rudder is turned in a clockwise direction, the entrance to the inlet passage will be nor- LBBT, 1 97 mal to the direction of flow of the water from blades 9 and 10, as indicated by arrows in Fig. 4.

The entrance to inlet opening 7 is cut at an angle, as shown in Fig.5, so that when rudder 1 is turned in a counter-clockwise direction the entrance to sthe inlet opening 7 will be normal to the direction of flow of the water from blades 9 and 10, as indicated by arrows in Fig. 5'.

In turning to port, as indicated in Fig. 4, the entrance to inlet opening 6 will be normal to the flow of water from blades 9 and 10. while the entrance to inlet opening 7 will not be. More water will then be forced through inlet opening 6, while less water will be forced through inlet opening 7.

In turning to starboard, as indicated in Fig. 5, the entrance to inlet opening 7 will be normal to the flow of water from blades 9 and 10, while the entrance to inlet opening 6 will not be. More water will then be forced into inlet opening 7, while less water will be forced through inlet opening 6.

The average amount of water entering both inlet passages 6 and 7 however, will be substantially the same in any position of the rudder.

A cooling system is thereby provided which is just as eflicient in coming about as in proceeding ahead, by cutting the entrances to inlet passages 6 and 7 at angles to make either passage conform substantially to the pitch of the propeller blades when the nudder is in either extreme position.

Bracket 18 may be provided with a stop 32 arranged to engage with a lug 33 formed integrally with tiller yoke 17, as shown in Fig. 3, to prevent vertical movement of the tiller yoke to a position where the upper end thereof will engage branches 26 and 27 of Y-connection 25 and lift the lower end of tube 3 from its proper position in seat 14.

The outlet connections 5 and 31 extend downwardly and terminate in coils 34 and 35. res ctively. The coils 34 and 35 are arrange so that the outlet ends 36 and 37 thereof are positioned a short distance above the level of the water, and are not submerged.

Rods 38 may be arranged in parallel relation across the entrances to inlet passages 6 and 7. as shown in Figs. 1. 4 and 5, to prevent solid matter from entering the passages.

The rudder 1 may be cast from any suitable metal such as aluminum and the pussages 2, 6 and 7 cored therein.

The operation of the water cooling system is as follows:

The actiouof propeller blades 9 and 10 forces water Into inlet passages 6 and 7 upwardly through passage 2, tube 3. connections 29 and 30 to water jackets 4 and 28, and thence through outlet connections 5 and 31 and coils 34 and 35.

. vided which operates elliciently when the adjacent to the blades water jacket supported by said housing, a

motor is running at low speed by roviding the coils 34 and 35 at the lowdr ends of outlet pipes 5 and 31.

By providing the rudder with inlet pas-- sages 6 and 7 having their inlet ogenings ar-v ran d adj went to the propeller lades and lea ing toward a common go 2, more even circulation of water is effected.

There are no valves to wear and decrease the etliciency of the system, the only wear being at the end of tube 3. Any wear at the end of tube 3 caused by the movement of seat 14 is compensated for by sprin 2}),

which holds the lower end of the tu in close engagement with the seat, as explained more fully above. water coolin system is therefore in no way afl'ected by t e action of sandy, muddy or salt water. a j

When the motor stops the water drains. from water jackets 4 and 28 through connections 29 and 30 and tube 3. The water also drains freely from outlet connections 5 and 31 and coils 34 and 35. Thewater cooling system is thereby self-draining, so that there is no danger of water freezing in the jackets or connections. V

Various changes of structure and arrangement, of the parts may be adopted without departing from the spirit of the invention or the scope of the claims.

The Invention claimed is: 4 1. In a water cooling system for outboard motors, in combination, a housing, a propeller sup rted at the lower end of .said housing, said rudder being provided with a pas sage having the inlet end thereof arranied adjacent to said dpropeller, a water jet: et supported by sai housing, a tube connecting said water jacket with the outlet end of said passage, and an outlet connection lead-v ing from said water jacket.

2. In a water cooling system for outboard motors, in combination, a housing, asropel ler supported at the lower end of sal hons ing, a rudder givotallv mounted to said housing, said ru passage having the inlet en thereof formed to comprise two inlet 1 w: terminating of Said propeller. a

tube connecting said water jacket with the outlet and ot said passage, and an outlet connectlon leading from said water-jacket.

3. In a water cooling system for outboard motors, in combination, a bond a propeller supported at the lower of said housing, a rudder pivotally mounted to said The elliclency of the der being rovided with av jacket supported by sai housing, said rudder being rovided with a passage having the inlet en thereof formed to comprise two inlet passages terminating ad acent to the blades of said propeller and cut at angles to make either conform substantlall to the pitch of said blades when said ru der is in either extreme position, a water jacket supported by said housing, a tube cpnnecting said -water jacket with the outlet end of said passage, and an outlet connection leading from said water jacket.

4. In a water cooling system for outboard motors, in combination, a housing, a propeller supported at the lower end of said casing, a rudder pivotally mounted to said housing, said rudder being provided with a passage having the inlet end thereof arrange ad acent to said pro ller, a water acket supported by said housing, and a tube supporte by said housing and arranged to connect said water jacket with-the outlet end of said passa e, said tube roviding a ivotal connectlon for said -ru der to said ousing.

5. In a water cooling system for outboard motors, in combination, a housin a propeller supported at the lower on of said housing, a rudder ivotally mounted to said housing, said ruddiir being provided with a passa e having the inlet end thereof ar-- .nectin said water jacket with the outlet end -of sai passage, theontlet end of said pasas being provided with a seat, the lower on 'of said tube being fitted to sa1d seat, and

a s ring arranged to holdthe lower end of 4 sai tube in operative position in said seat.

'6. In a water cooling system for outboard motors, in combination, a housing, a proller supported at the lower end of said casing, a rudder pivotally mounted to said housing, said rudder being provided with a passage having the inlet end thereof arhranged adjacent to said propeller, a water j acket sudpported by said housing, a tube pp a said housing and arrangedto connect said water jacket with the outlet end of said passage said tube roviding a ivotal connection or said ru der to said basin ,and a spring arranged on said tube to hol the lower end thereof in operative engagement with the outlet end of said pasg In a water cooling system for outboard motors, in combination, a housin a proller supported at the lower en. of said mousing, a rudder ivotally mounted to said housing, said rud er being provided with a passage having the inlet end thereof arranged adjacent to said (propeller, a water housing, a tube connecting said water 'acket with the outlet end of said pass e, t e outlet end of said passage being provided with a seat, the lower end of said tube being fitted to said seat, a spring arranged to hold the lower end of said tube in operative osition in said seat, a tiller yoke supported or movement with respect to said rudder and for interlocking engagement therewith, and a second spring arranged to hold said tiller yoke and said rudder in interlocking engagement.

8. In a water cooling system for outboard motors, in combination, a housin a propeller supported at the lower en of said housing, a water jacket supported by said housing, connections arranged to provider passage leadin from a point adjacent said propeller to said water jacket, and an outlet connection leading from said water jacket, the outlet end of said outlet connection being provided with a coil;

9. In a water cooling system for outboard motors, in combination, a housin a proller supported at the lower on of said ousing, a rudder pivotally mounted to said housing, said rudder being provided with a passage having the inlet end thereof arranged adjacent to said propeller, a water jacket supported by said housin a tube connectin said water jacket with t e outlet end of sai assage, and an outlet connection leading them said water jacket, the outlet end of said outlet connection being provided with a. coil arranged so that the outlet end thereof will be positioned above the level of the water when the motor is in use.

10. In a water cooling system for outboard motors,'in combination, a housing, a

ropeller sup orted at the lower end of said ousing, a ru der ivotally mounted to said housing, said rud or being provided with, a passage having "the inlet end thereof arrange adjacent to said propeller, a water jacket supported by said housing, and a tube supported by said housing andarranged to connect said water jacket with the outlet end of said passage, the outlet end of said outlet connection bei 7 provided with a coil arranged so that e outlet end thereof will be positioned above the level ofthe water when the motor is in use. v

11. The combination with an outboard motor having a cooling jacket, a depending shaft and a propeller mounted thereon, of a rudder mounted to the rear of said propeller and provided with a passage connected to said cooling j ack et at one end and arranged at its other end to receive a portion of the water forced rearwardly by said propeller.

12. The combination with the ropeller and water jacket of a'marine engine, of a rudder mounted to the rear of said propeller and provided with a passa communicating with said water jacket an arranged to receive a portion of the water forced rearwardly by said ropeller.

13. The combination with an outboard motor provided with a water cooling jacket having inlet and outlet openings, means for conducting water from a int to the rear of the propeller into sai jacket through said inlet opening and a coiled pipe attached to said out at openin for the discharge of water from sai jacket, said coile pipe acting to sustain the flow of water t rough said jacket for varying propeller 8 ds.

14, e combination with an outboard motor having a propeller and a water cooling system includin a water jacket and a rudder provided with a passage arranged to receive water forced rearwardly by said propeller, of a rigid tube connecting said passage to said'water jacket whereby water is caused to flow throu h the latter upon operation of said prope ler.

15. The combination with an outboard motor having a propeller and a water cooling system including a water jacket and a rudder rotatably connected to said motor and provided with a\passage arranged to receive water forced rearwar 1y by said propeller, of a tube connecting and passage to said water jacket whereby water is caused to flow through the latter uponoperation of said prope ler, the longitudinal axis of said tube bein coincident with the axis of rotation of sai rudder.

16. The combination with an outboard motor having a propeller and a water coolmg system ncluding a water jacket and a rudder pivotally connected to said motor and provided with a' passa arranged to receive water forced rearwar y by said propeller, of a rigid tube connecting said passage to said water jacket whereby water is caused to flow through the latter upon operation of said prope ler, said tube also acting to pivotally connect said rudder to said motor.

17. The combination with a water-jacketed marine engine having an intake pipe extending below the water line and ada ted to receive water forced rearwardly y the Ipropeller and to conduct the same upwar ly into said water jacket, of an outlet conduit leading from said jacket and terminating above the water line and being so formed as to materially increase the distance of travel of the water in its flow from said jacket to the outlet end of said conduit to thus sustain the flow of said water over an increased range of propeller speeds.

18. The combination with a water-jacketed marine engine having an intake pipe extending below the water line and adapt ed to conduct water from the propeller ulpwardly into said water jacket of an out at connection leading from sa' jacket and means associated therewith tending to sustain the flow for varying propeller speeds, said means comprising a coil interposed in said outlet connection.

19. The combination with the water jacket of a marine engine of a rudder having a passage formed t erein and arranged to receive water upon forward movement of the boat, and means connecting said passage to said water jacket. I

20. The combination with an outboard motor having a water jacket and a propeller, of a rudder supported adjacent to said propeller and having a passage formed therein, said passage being arranged to receive a portion of the water direction by said propeller, and means connectin said passage to said water jacket whereiiy said portion of the water is caused forced in one" to flow through said water jacket.

21'. The combination with an outboard motor having a water 'acket and a propeller, of a rudder supporte adjacent to said propeller and havini a passageformedthere- 1n,'said passage eing arranged to receive a portion of the water forced. in one direction by said propeller, and a rigid tube connecting said passage to said water jacket whereby said portion of the water is caused to flow through said water jacket.

In witness whereof I hereto aflix my signature.

OLE EVINRUDE.

19. The combination with the water jacket of a marine engine, of a rudder having a passage formed therein and arranged to receive water upon forward movement of the boat, and means connecting said passage to said water jacket.

20. The combination with an outboard motor having a water jacket and a propeller, of a rudder supported adjacent to said propeller and having a passage formed therein, said passage being arranged to receive a portion of the Water forced in one direction by said propeller, and means connecting said passage to said Water jacket 15 whereby said portion of the water is caused to flow through said water jacket.

21. The combination With an outboard motor having a water jacket and a propeller, of a rudder supported adjacent to said proeller and havin a passageformed there- 1n, said passage eing arranged to receive a portion of the water forced in one direction by said propeller, and a rigid tube connecting said passage to said water jacket whereby said portion of the water is caused to flow through said water jacket.

In witness whereof I hereto aflix my signature.

OLE EVINRUDE.

Certificate of Correction.

It is hereby 1925, upon the a provement in that the certified that in Letters Patent No. 1,567,127, pl1cat1on of Ole Evinrude. of Milwaukee,

ater-Coohng Systems for Outboard Motors,

the printed specification requiring correction as after the word housing insert the words a housing; and that the said Letters Patent should ranted December 29, isco-nsin, for an iman error appears in, follows: Page 3, lines 42 and 43, rudder pw votally mounted to saidbe read With this correction therein same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 26th day of January, A. D. 1926.

, VVM A KIN NAN, Actmg Oommzaaioner of Patents.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,567,127, ranted December 29, 1925, upon the a plication of Ole Evinrude. of Milwaukee, isconsin, for an improvement in ater-Cooling Systems for Outboard Motors, an error appears in the printed specification requiring correction as follows: Page 3, lines 42 and 43, after the word housing insert the words a rudder pivotally mounted to said housing; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 26th day of January, A. D. 1926.

[SEAL] WM. A. KINNAN,

Acting Commissioner of Patentq. 

